Experimental observation of lattice distortions due to a flux line lattice in niobium K.-U. Neumann, F. Kusmartsev, H.-J. Lauter, O. Schärpf, T. J. Smith and K. R.A. Ziebeck Eur. Phys. J. B, 1 1 (1998) 5-9 Published online: 15 January 1998 DOI: 10.1007/s100510050146